Dear {Name},
I'm so sorry I brought up {triggering topic}. I stupidly forgot that this is a trigger for you. At the very least, I should have given you a heads up so you had the option to bow out of the {conversation/event/class}.
I respect your life experience and never want to be the reason you relive such a terrible {event/time in your life}. Please accept my apology as well as my assurances that this will never happen again.
Sincerely,
{Name}
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Index of letter of apology templates